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#61
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I would put a 2.75 first gear set in the Th-400. With the 2.56 and a long stroke engine it will preform nicely.. Run a nice 068 or a Nunzi 2042 if you can even find them..
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#62
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I'm running just the stock 2.48 first gear set in the TH400 in my '67 with the stock 400 engine and the 2.56 and it's fine for a cruiser. I agree that 2.75 would wake it up a bunch from the dig. But 2.56 rears came with straight 6 and 326 powered A bodies, so a 389-400 really has zero issue pulling that gear. My 400 is a 9.3 CR with an 068 cam and runs great.
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Jeff |
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#63
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63 Catalina coupe 467 cid budget drag car 11's 1/4 , 7.20 1/8th pump gas n/a 66 Star Chief Executive 57k mile 67 IH Scout project 2WD "Indian Scout" 69 Le Mans 2 dr HT 350 85k mile 15 sec 1/4 69 Firebird 400 Burgandy/Black 70 Olds Rallye 350 F85 4 speed 3.91's 70 Olds Cutlass Cruiser Red Wagon 350 101k miles 15 sec 1/4 12 sec w 455 74 Cheyenne Super C10 LWB Gen 6 454 w ZZ502 cam 3.07gear 13.1 1/4, 8.3 1/8 2020 RAM 1500 SLT 4x4 5.7 A8 Hemi 2007 Hummer H3 3.7 liter turd |
#64
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On my old 64 Impala tipping every ring gear bolt out because there was a spacer(did not know about those until then) I'd sure pass on doing that. Buddy in college had a 64 GTO put a wagon 2.56 in to get batter gas mileage going from College Station to Dallas. I swear idling in first gear was 20 mph!
My 78 TA had 2.56s for a long time and for just a street car they were OK. mid to high 14 second 1/4 miles, barely in 3rd.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#65
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You have an excellent drivetrain. The 068 is an excellent cam for a Pontiac street mill. We used to get the Nunzi version of this cam called the 2041..
There is an amazing amount of power just sitting there under your hood, get a custom torque converter. You have an excellent drivetrain. 9.3 compression is perfect. Use only 87 octane I like B.P. A higher octane will make the engine run slower. I used to tune them and get them run real strong. First thing is keep the points distributor, disconnect the vacuum advance and screw down the points plate. Next set the initial to 20 and the mechanical for 16 to 18. Have it all in by 2000 rpm, this will work so well with the 2.56.. Next pick up a CD box. I like the Vertex Z-6. This will give the ignition some real power. Unless you want to run a Magneto. I ran one on a 389 with dual quads back in the seventies. I got it for nothing, it was a Ronco.. Hurst made the best automatic shifter for the Turbo 400 called the Autostick I. I use them in all my Turbo 400 cars.. They bolt to the transmission and have direct linkage. They look just like a four speed too.. This is the Autostick I in my 69 el Camino SS396 TH-400. It shifts as well as it looks.. I also had one in my 64 Bonneville.. These places are were you should be at with your car. The driveline is perfect!! It just needs some tuning. Last edited by 389; 04-25-2022 at 05:43 PM. |
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